Topical Test 7 : Gaseous Exchange

2. Which of the following is the respiratory pigments found in human blood?

• haemoglobin
• myoglobin
• haemocyanin

4. Each haem group in haemoglobin can bind to

• 1 oxygen molecule
• 2 oxygen molecule
• 3 oxygen molecule
• 4 oxygen molecule

5. Which of the following is NOT a characteristic of haemoglobin?

• has high affinity to oxygen even at low partial pressure of oxygen
• can release oxygen when partial pressure of oxygen decrease
• can bind reversibly with oxygen
• can bind and release oxygen randomly

6. The main mode of carbon dioxide transport in blood is

• bind with haemoglobin to form carbaminohemoglobin
• Dissolved in plasma
• Bicarbonate ions in plasma

7. Which of the following converts CO2 into carbonic acid in the cytoplasm of red blood cell?

• Hemoglobin
• Oxyhemoglobin
• Carbonic anhydrase
• Hydrogen carbonate

8. Which process in erythrocytes is catalysed by carbonic anhydrase enzyme?

• Dissociation of oxyhemoglobin to release oxygen
• Binding of hemoglobin with oxygen to form oxyhemoglobin
• Dissociation of carbonic acid to release bicarbonate ions
• Reaction between water and carbon dioxide to form carbonic acid

9. Which ion diffuses out when it accumulates in red blood cells?

• hydrogen ion
• bicarbonate ions
• chloride ions

10. What is the function of chloride shift?

• To balance the pH level in erythrocyte
• To balance the electrochemical charges in erythrocyte
• To balance the CO2 concentration in cells
• To bind with H+ ions forming hydrochloric acid

11. Oxygen dissociation curve of haemoglobin is __________ shape

• sigmoid curve
• straight lines
• hyperbolic curve

13. Oxygen dissociation curve of haemoglobin will shift to the ______________ when partial pressure of CO2 in the tissue increase

• left
• right